Conciseness

The body is dense and reference-like — commands, tables, and executable code dominate, and domain-specific concepts (x402, EIP-3009, ERC-8257 manifest hashing) are things Claude does not already know, so explaining them earns their tokens. Minor trimming opportunities keep it at 4 rather than 5: Examples A–F repeat command patterns already shown in sections 1–3, and section 7 includes two full TypeScript blocks where one plus a note would do.

Actionability

Guidance is fully executable throughout: copy-paste-ready `npx @opensea/tool-sdk` CLI commands for every lifecycle stage, complete TypeScript snippets for manifest/handler/adapters, concrete curl examples with real contract addresses, and exact flags (e.g., `--erc20-gate 0xTOKEN_ADDRESS --erc20-min-balance 1000000000000000000`). This matches the 5 anchor (copy-paste ready, specific examples covering common cases) — the open-access, paid, NFT-gated, subscription, ERC-20, and combined-gate cases are all covered.

Workflow Clarity

The workflow is clearly sequenced (scaffold → define manifest → handler → adapter → register → gate → call), and validation/feedback mechanisms exist: `--dry-run` for registration, the `verify`/`inspect`/`smoke`/`dry-run-gate` commands, and a response-code table with per-code recovery actions. It falls short of 5 because the checkpoints are listed as available options rather than woven into the sequence (no explicit "dry-run first, then register, then verify the toolId onchain" step), and the end-to-end examples don't include a verification step after registration.

Progressive Disclosure

The SKILL.md body is a genuine overview and the three referenced files (x402.md, predicate-gating.md, known-predicates.md) all exist, contain substantive material, and are exactly one level deep with no further nesting. References are well signaled with a gating summary table plus per-file descriptions in the References section, and detail (predicate encodings, payment protocol internals) is correctly deferred to them. This matches the 5 anchor.

Specificity

The description lists multiple concrete actions — "Scaffold HTTPS tools with JSON Schema interfaces, register them onchain, gate access via NFT ownership, subscriptions, trait gating, or x402 pay-per-call (USDC), and call gated tools" — covering the full provider and consumer lifecycle comprehensively. It matches the 5 anchor (multiple specific concrete actions, comprehensive coverage) and exceeds the 4 anchor, which allows minor coverage gaps; none are evident.

Completeness

The "what" is clear and detailed, but there is no affirmative "Use when..." trigger clause — the only scope guidance is the negative handoff "For querying OpenSea marketplace data use opensea-api instead", which implies when not to use it rather than stating when to use it. Per the guideline that a missing 'Use when' clause (or equivalent explicit affirmative trigger guidance) caps completeness at 3, this fits the 3 anchor (clear what, when missing or only weakly implied) rather than 4.

Trigger Term Quality

Good natural keyword coverage: "register", "gate access", "NFT ownership", "subscriptions", "pay-per-call", "USDC", "tool endpoints" are phrases a user with this need would say. A few natural variations are missing (e.g., "monetize an API", "AI agent tool", "charge per call"), and terms like ERC-8257 are jargon-only, so it sits at the 4 anchor rather than the 5 anchor's comprehensive synonym coverage.

Distinctiveness Conflict Risk

The niche is distinct — "OpenSea Tool Registry (ERC-8257)" tool publishing/gating — and the explicit handoff to `opensea-api` for marketplace data actively prevents the most likely mis-trigger. Clear niche with distinct triggers and minimal conflict risk, matching the 5 anchor.